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vendors/flot-spline/js/jquery.flot.spline.js

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+/**
+ * Flot plugin that provides spline interpolation for line graphs
+ * author: Alex Bardas < alex.bardas@gmail.com >
+ * modified by: Avi Kohn https://github.com/AMKohn
+ * based on the spline interpolation described at:
+ *     http://scaledinnovation.com/analytics/splines/aboutSplines.html
+ *
+ * Example usage: (add in plot options series object)
+ *    for linespline:
+ *      series: {
+ *        ...
+ *        lines: {
+ *          show: false
+ *        },
+ *        splines: {
+ *          show: true,
+ *          tension: x, (float between 0 and 1, defaults to 0.5),
+ *          lineWidth: y (number, defaults to 2),
+ *          fill: z (float between 0 .. 1 or false, as in flot documentation)
+ *        },
+ *        ...
+ *      }
+ *    areaspline:
+ *      series: {
+ *        ...
+ *        lines: {
+ *          show: true,
+ *          lineWidth: 0, (line drawing will not execute)
+ *          fill: x, (float between 0 .. 1, as in flot documentation)
+ *          ...
+ *        },
+ *        splines: {
+ *          show: true,
+ *          tension: 0.5 (float between 0 and 1)
+ *        },
+ *        ...
+ *      }
+ *
+ */
+
+(function($) {
+  'use strict'
+
+  /**
+   * @param {Number} x0, y0, x1, y1: coordinates of the end (knot) points of the segment
+   * @param {Number} x2, y2: the next knot (not connected, but needed to calculate p2)
+   * @param {Number} tension: control how far the control points spread
+   * @return {Array}: p1 -> control point, from x1 back toward x0
+   *          p2 -> the next control point, returned to become the next segment's p1
+   *
+   * @api private
+   */
+  function getControlPoints(x0, y0, x1, y1, x2, y2, tension) {
+
+    var pow = Math.pow,
+      sqrt = Math.sqrt,
+      d01, d12, fa, fb, p1x, p1y, p2x, p2y;
+
+    //  Scaling factors: distances from this knot to the previous and following knots.
+    d01 = sqrt(pow(x1 - x0, 2) + pow(y1 - y0, 2));
+    d12 = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
+
+    fa = tension * d01 / (d01 + d12);
+    fb = tension - fa;
+
+    p1x = x1 + fa * (x0 - x2);
+    p1y = y1 + fa * (y0 - y2);
+
+    p2x = x1 - fb * (x0 - x2);
+    p2y = y1 - fb * (y0 - y2);
+
+    return [p1x, p1y, p2x, p2y];
+  }
+
+  var line = [];
+
+  function drawLine(points, ctx, height, fill, seriesColor) {
+    var c = $.color.parse(seriesColor);
+
+    c.a = typeof fill == "number" ? fill : .3;
+    c.normalize();
+    c = c.toString();
+
+    ctx.beginPath();
+    ctx.moveTo(points[0][0], points[0][1]);
+
+    var plength = points.length;
+
+    for (var i = 0; i < plength; i++) {
+      ctx[points[i][3]].apply(ctx, points[i][2]);
+    }
+
+    ctx.stroke();
+
+    ctx.lineWidth = 0;
+    ctx.lineTo(points[plength - 1][0], height);
+    ctx.lineTo(points[0][0], height);
+
+    ctx.closePath();
+    
+    if (fill !== false) {
+      ctx.fillStyle = c;
+      ctx.fill();
+    }
+  }
+
+  /**
+   * @param {Object} ctx: canvas context
+   * @param {String} type: accepted strings: 'bezier' or 'quadratic' (defaults to quadratic)
+   * @param {Array} points: 2 points for which to draw the interpolation
+   * @param {Array} cpoints: control points for those segment points
+   *
+   * @api private
+   */
+  function queue(ctx, type, points, cpoints) {
+    if (type === void 0 || (type !== 'bezier' && type !== 'quadratic')) {
+      type = 'quadratic';
+    }
+    type = type + 'CurveTo';
+
+    if (line.length == 0) line.push([points[0], points[1], cpoints.concat(points.slice(2)), type]);
+    else if (type == "quadraticCurveTo" && points.length == 2) {
+      cpoints = cpoints.slice(0, 2).concat(points);
+
+      line.push([points[0], points[1], cpoints, type]);
+    }
+    else line.push([points[2], points[3], cpoints.concat(points.slice(2)), type]);
+  }
+
+  /**
+   * @param {Object} plot
+   * @param {Object} ctx: canvas context
+   * @param {Object} series
+   *
+   * @api private
+   */
+
+  function drawSpline(plot, ctx, series) {
+    // Not interested if spline is not requested
+    if (series.splines.show !== true) {
+      return;
+    }
+
+    var cp = [],
+      // array of control points
+      tension = series.splines.tension || 0.5,
+      idx, x, y, points = series.datapoints.points,
+      ps = series.datapoints.pointsize,
+      plotOffset = plot.getPlotOffset(),
+      len = points.length,
+      pts = [];
+
+    line = [];
+
+    // Cannot display a linespline/areaspline if there are less than 3 points
+    if (len / ps < 4) {
+      $.extend(series.lines, series.splines);
+      return;
+    }
+
+    for (idx = 0; idx < len; idx += ps) {
+      x = points[idx];
+      y = points[idx + 1];
+      if (x == null || x < series.xaxis.min || x > series.xaxis.max || y < series.yaxis.min || y > series.yaxis.max) {
+        continue;
+      }
+
+      pts.push(series.xaxis.p2c(x) + plotOffset.left, series.yaxis.p2c(y) + plotOffset.top);
+    }
+
+    len = pts.length;
+
+    // Draw an open curve, not connected at the ends
+    for (idx = 0; idx < len - 2; idx += 2) {
+      cp = cp.concat(getControlPoints.apply(this, pts.slice(idx, idx + 6).concat([tension])));
+    }
+
+    ctx.save();
+    ctx.strokeStyle = series.color;
+    ctx.lineWidth = series.splines.lineWidth;
+
+    queue(ctx, 'quadratic', pts.slice(0, 4), cp.slice(0, 2));
+
+    for (idx = 2; idx < len - 3; idx += 2) {
+      queue(ctx, 'bezier', pts.slice(idx, idx + 4), cp.slice(2 * idx - 2, 2 * idx + 2));
+    }
+
+    queue(ctx, 'quadratic', pts.slice(len - 2, len), [cp[2 * len - 10], cp[2 * len - 9], pts[len - 4], pts[len - 3]]);
+
+    drawLine(line, ctx, plot.height() + 10, series.splines.fill, series.color);
+
+    ctx.restore();
+  }
+
+  $.plot.plugins.push({
+    init: function(plot) {
+      plot.hooks.drawSeries.push(drawSpline);
+    },
+    options: {
+      series: {
+        splines: {
+          show: false,
+          lineWidth: 2,
+          tension: 0.5,
+          fill: false
+        }
+      }
+    },
+    name: 'spline',
+    version: '0.8.2'
+  });
+})(jQuery);

vendors/flot-spline/js/jquery.flot.spline.min.js

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+!function(a){"use strict";function b(a,b,c,d,e,f,g){var j,k,l,m,n,o,p,q,h=Math.pow,i=Math.sqrt;return j=i(h(c-a,2)+h(d-b,2)),k=i(h(e-c,2)+h(f-d,2)),l=g*j/(j+k),m=g-l,n=c+l*(a-e),o=d+l*(b-f),p=c-m*(a-e),q=d-m*(b-f),[n,o,p,q]}function d(b,c,d,e,f){var g=a.color.parse(f);g.a="number"==typeof e?e:.3,g.normalize(),g=g.toString(),c.beginPath(),c.moveTo(b[0][0],b[0][1]);for(var h=b.length,i=0;h>i;i++)c[b[i][3]].apply(c,b[i][2]);c.stroke(),c.lineWidth=0,c.lineTo(b[h-1][0],d),c.lineTo(b[0][0],d),c.closePath(),e!==!1&&(c.fillStyle=g,c.fill())}function e(a,b,d,e){(void 0===b||"bezier"!==b&&"quadratic"!==b)&&(b="quadratic"),b+="CurveTo",0==c.length?c.push([d[0],d[1],e.concat(d.slice(2)),b]):"quadraticCurveTo"==b&&2==d.length?(e=e.slice(0,2).concat(d),c.push([d[0],d[1],e,b])):c.push([d[2],d[3],e.concat(d.slice(2)),b])}function f(f,g,h){if(h.splines.show===!0){var k,l,m,i=[],j=h.splines.tension||.5,n=h.datapoints.points,o=h.datapoints.pointsize,p=f.getPlotOffset(),q=n.length,r=[];if(c=[],4>q/o)return a.extend(h.lines,h.splines),void 0;for(k=0;q>k;k+=o)l=n[k],m=n[k+1],null==l||l<h.xaxis.min||l>h.xaxis.max||m<h.yaxis.min||m>h.yaxis.max||r.push(h.xaxis.p2c(l)+p.left,h.yaxis.p2c(m)+p.top);for(q=r.length,k=0;q-2>k;k+=2)i=i.concat(b.apply(this,r.slice(k,k+6).concat([j])));for(g.save(),g.strokeStyle=h.color,g.lineWidth=h.splines.lineWidth,e(g,"quadratic",r.slice(0,4),i.slice(0,2)),k=2;q-3>k;k+=2)e(g,"bezier",r.slice(k,k+4),i.slice(2*k-2,2*k+2));e(g,"quadratic",r.slice(q-2,q),[i[2*q-10],i[2*q-9],r[q-4],r[q-3]]),d(c,g,f.height()+10,h.splines.fill,h.color),g.restore()}}var c=[];a.plot.plugins.push({init:function(a){a.hooks.drawSeries.push(f)},options:{series:{splines:{show:!1,lineWidth:2,tension:.5,fill:!1}}},name:"spline",version:"0.8.2"})}(jQuery);